Boost refers to the increase in pressure that is generated by the turbocharger in the intake manifold that exceeds normal atmospheric pressure. Manifold pressure should not be confused with the amount, or "weight" of air that a turbo can flow.
Boost pressure is limited to keep the entire engine system including the turbo inside its thermal, and mechanical design operating range by controlling the wastegate which shunts the exhaust gases away from the exhaust side turbine.
The maximum possible boost depends on the fuel's octane rating . Also, Depending on the engine you may be able to run more or less boost than other cars. To run higher boost you need to have a source to cool the charging air. With proper tuning and efficient charge cooling, you can run upwards to 15 PSI of boost pressure on a stock motor.
Boost pressure is limited to keep the entire engine system including the turbo inside its thermal, and mechanical design operating range by controlling the wastegate which shunts the exhaust gases away from the exhaust side turbine.
The maximum possible boost depends on the fuel's octane rating . Also, Depending on the engine you may be able to run more or less boost than other cars. To run higher boost you need to have a source to cool the charging air. With proper tuning and efficient charge cooling, you can run upwards to 15 PSI of boost pressure on a stock motor.
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